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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A335961 Alternating factorions: Numbers m such that m = S_af(m) = af(d_1)+af(d_2)+...+af(d_k) where d_1 d_2 ... d_n is the decimal expansion of m and af(m) = m!-(m-1)!+(m-2)!+...1! (alternating factorial) with af(0) = 0 (base 10).

Table of values

n a(n)
1 0
2 1
3 620
4 621
5 643

List of values

[0, 1, 620, 621, 643]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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